[Piglit] [PATCH v2] compute: add an execution test for shared atomics

[Ilia Mirkin]

This adds a very simple test of atomicAdd on a shared variable.

Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
---

v1 -> v2:
 - use an atomic
 - allow the local size to be messed with easily without changing other bits

 .../execution/shared-atomics.shader_test           | 36 ++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 tests/spec/arb_compute_shader/execution/shared-atomics.shader_test

diff --git a/tests/spec/arb_compute_shader/execution/shared-atomics.shader_test b/tests/spec/arb_compute_shader/execution/shared-atomics.shader_test
new file mode 100644
index 0000000..65f150a
--- /dev/null
+++ b/tests/spec/arb_compute_shader/execution/shared-atomics.shader_test
@@ -0,0 +1,36 @@
+# Verify simple usage of atomics and shared variables
+
+[require]
+GL >= 3.3
+GLSL >= 3.30
+GL_ARB_compute_shader
+GL_ARB_shader_atomic_counters
+
+[compute shader]
+#version 330
+#extension GL_ARB_compute_shader: enable
+#extension GL_ARB_shader_atomic_counters: enable
+
+layout(local_size_x = 2, local_size_y = 3) in;
+
+shared uint value;
+layout(binding = 0) uniform atomic_uint pass;
+const uint size = gl_WorkGroupSize.x * gl_WorkGroupSize.y * gl_WorkGroupSize.z;
+
+void main()
+{
+   if (gl_LocalInvocationIndex == 0u)
+      value = 0u;
+   barrier();
+   atomicAdd(value, gl_LocalInvocationIndex);
+   barrier();
+   if (gl_LocalInvocationIndex == 0u) {
+      if (value == size * (size - 1u) / 2u)
+         atomicCounterIncrement(pass);
+   }
+}
+
+[test]
+atomic counters 1
+compute 2 3 4
+probe atomic counter 0 == 24
-- 
2.4.10